Ok after reading this thread I'm a little confused about what the solution should be on a boosted eco.

What PJ points out makes sense, he said he saw vacuum at the fitting on the valve cover? So I'm guessing this means gasses should be venting back through and out the head into the intake manifold as one would expect in a PCV system. If that's the case where is the PCV valve? If there isn't a PCV valve then maybe under boost we are effectively reversing the system and thus pressurizing the valve cover fitting? I doubt this because I haven't seen that kind of boost leak.

I had assumed for the past year there wasn't a true PCV system on the ecotec and that the valve cover was just vented. I have mine hooked up to catchcan < One Way Valve < Pre-Turbo Intake.

After a year I have only a very small amount of oil residue in my catch can.

So what is going on?


___________________________________________________________________

Mitsu TD06-20g |3" Turbo-back Exhaust | 61mm Bored TB |
HP Tuners | Innovate WB02 | Spec Stage 3 | Team Green LSD | TurboTech Upper | Full Addco Sways | Sportlines & Yellows |

Has there been any progress on this ???




Jason
99 Z24 Supercharged
157hp/171tq - NA
190hp/170tq @ 6psi

LD9 for Life

Would the same issue apply to someone with a 2.3 head on a 2.4 block??? The 2.3 head does not have the PCV provision so it would cover up the PCV hole in the block




Jason
99 Z24 Supercharged
157hp/171tq - NA
190hp/170tq @ 6psi

LD9 for Life

I have an idea... Please let me know if this wont work.

If you pull the oil dipstick out wouldn't that allow for crankcase pressure to escape?

If I am not mistaken the issue causing the turbos to fail prematurely is positive crankcase pressure is ending up inside the center housing of the turbo and hindering proper oiling of the turbo. So if you remove the dipstick from the hole it should vent the pressure.

Also what did GM do with the 2.0 turbo cars? Or even the Saab turbo Ecotec cars? How does there PCV system look?

Thanks
Darryn


2004 Cavalier coupe, 5 speed, White
GO
Hahn Stage 2, Eagle rods, Wiseco 8.9, SS Valves, Dual valve springs, valve job, Ti seats and retainers
spec stage 3, Fidanza 7.5lb flywheel, Short Shifter
Slotted and dimpled rotors, EBC green stuff
SHOW
VIS EVO CF hood, KOBE KAM 5 17", Nexxen N3000, Ebay Black tails and filler, 5% tint
Gold line springs, Tokiko D-spec struts
ELECTRONICS
Kenwood in-dash DVD and Navigation, single Kicker CompVR
http://www.cardomain.com/ride/2974835

I'm working on my 2.2 turbo project and reading a lot about PCV systems.

On the 2.2 head, there is a small port that pulls vapor from under the valve cover and routes into the intake manifold gasket area (cylinders 2 & 3). So under idle you've got full vacuum pulling out vapors and burning them.

You have many options here for your set-up.

1. use a check valve so only under vacuum it will pull from vapors, under boost it's sealed off. But now when you're under boost you need your catch can vented to atmosphere or connected to your turbo intake so the blow-by can properly vent and your catch can should not connect to your intake since it's not under vacuum.

2. You can take both PCV fittings to a catch can vented to atmosphere - but now you don't really have anything vacuum assisted pulling the gasses and helping your HP numbers.

3. Using bernoulli principle connect that catch can to your exhaust system (a cool location) (at a small angle similar to a wastegate so flow goes past not into your tube) the exhaust gasses flowing past the opening will pull a vacuum to your can. You will need to occassionally dump the can or you can run a drain back to your pan for excess oil.

4. Keep searching under PCV in the forums you'll find more...

So, what did you eventually end up doing? Any pics?